Holdfast for shading-films.



F. cow/m.

HOLDFAST FOR SHADING FILMS.

APPLICATION FILED AUG-2. I917! mmm Patemqad Feb. 5, 1918.

2 SHEETS-SHEET J Ema, flue M4701 v E1; B ff; atio'umu F. COWAN.

HOLDFAST FOR SHADING FILMS.

APPLICATION FILED AUGJZ. l9l7.

Patented Feb. 5,1918.

2 SHEETS-SHEET 2.

I llhllTFD fi TitTFfi PATENT UFFlWF,

FLETCHER COWAN, 0F SUMMIT, JERSEY, ASSIGNOR TO BEN DAY INQ, 0F SUMMIT, NEW JERSEY, A CORPORATION OF NEW JERSEY.

I-IOLDFAST FOR SHADING-FILMS.

Specification of Letters Patent.

Patented rent, ieie;

Application filed August 2, 1917. Serial No. 184,095.

nection with what are known in theprinting art as shading films for printing on drawe ing surfaces of stone, metal, cardboard,

paper, or other surfaces and more particu larly to that, type of machine covered by United States patents issued to Benjamin Day, Numbers 7 83,823, 813,867 and 941,500.

One of the objects of my invention is to provide such a machine with a small-aread, laterally contracted base and with increased height which will take up less room upon the work table and give an increased bearing weight onthe smaller area, thus avoiding uncertain leveling of the machine on an unequal table surface, and providing, with its felt friction strips arranged transversely to the base, a firm support which will not swerve under the side pressures arising from inserting and removing a film frame from between its hinges on the machine.

Another object of my invention is to connect the swinging sectors of the machine which carry the adjustable arms, so that they will move in unison and prevent gagging or binding of the parallel rods carrying the cross rod on which the film frame is mounted.

Another object of my invention is to provide a back rest for the film frame, when turned up from the work, so that the delicate fabric of the shading; film will not be in jured by contact with the machine parts at its rear and so that no matter what position the adjustable arms and film frame holder may take, the film frame holder carrying the film may be readily thrown back against its stop, so as to inspect the work, in any of the innumerablepositions that the film frame holder may take. 1

My invention, moreover, provides means whereby the small-based holdfast may,

nevertheless, in connection with a single.

standardwidth of frame clamp be utilized to hold filmframes of anysize,.which,ifde:

sired, can be of such size as to project laterally beyond the base of the machine.

y invention also provides ready access to and manipulation of the hinges when adthe drawing.

From the above construction arise the ad vantages of increased rigidity of the base and an easier manipulation of the machine with increased accuracy of the work done usting the film frame to a finer level, on

by the shading film. and its micrometric registry adjusters.

With the above and other objects in view,

my invention consists in the parts, improve-v merits and combinations hereinafter more fully pointed out.

eferring now to the drawings attached to the specification:

Figure lis a plan view of the holdfast showing a film frame clamped in position and arranged upon the works. Fig. 2 is a detail view partly in section showing the operation of the back rest for the film frame Fig. 3 is a side view of the holdfast and filmframe carried thereby supported upon the stone;

Fig. 4 is a the holdfast; and

Fig. 5 is a section of the base;

Fig. 6 is a View of a modification.

The portable base 1 of the machine is of a small, laterally contracted area with rec-.

tangular edges which will permit the ma chine to be placed on any desired spot upon the work table or stone, avoiding the uncere tainty arising from the attempt to levels perspective view of the base of long based machine on an unequal table surface and serves as a guide for alining the work when necessary. The small base allows the'apparatus to be used with small surfaces to be worked upon and nearer the edges of the drawings to be tinted. The base is so concentrated and so proportioned, shaped and balanced, that once set in workable position upon, or in workable position near to, a drawing on stone, card-board, or metal, it

7 acts as a stabilizer holding such position immovably against ordinary accidental jar or thrust, and also against the working pressure, leftward or rightward, necessary duringthe courseof operations to engage the frame clamp ofa printing film bet een the j pintles :of itsmicrometric adjusting appathe front,.allof which results in a steadier of the rod. Locking means, such as set screws and firmermachine. This is especially desirable in order to withstand, without tilting, the leverage of the frontal cross rod carrying the 'micrometric ad usters, the film frame clamp and the printing film, when the parallel side rods are extended, raised" or lowered, so as to properly position the print ing film, without disturbing the register of the tint. lVhile the precise proportions may be varied, I prefer to make the baseapproxi- 'mately half as high as it is wide, and by Width 1 mean its l'neasurement from side to slde, not from front to rear.

Sultable upright standards pair of rocking sectors l, one at each'end 5, are provided for locking the sectors to the pivot rod. The sectors are held' in their rocked positions bylarge thumb screws 6 engaging arcs in the sectors and screw into the sides of the base. The forward hinge rod? of the machine is rigidly mounted in the ends 8 of the parallel carrying rods 9.

Set screws 10 are provided for firmly clamp ing the forward hinge heads on the rods;

The parallel side rods pass through open bearings 11 forming part of the sectors. The

parallel rods are secured in their forwardly adjusted positions in their openbearingsby means of thumb screwsl2. In order to preventgagging or binding of the parallel rods and to compel the swinging sectors of the machine'to move in unison, I provide means for connecting them which in the form of the invention illustrated comprises a con-.

necting bar 13. By this means the two open bearings 11 are-kept in alinement no matter what may be the rocked'position of the sec-1 tors so that the parallel rods and the hinge. rod which they support may be adjusted across the work without gagging and binding of the parts. This secures the even settlement of the forward cross rod bearingl "thead usters and the printing film to a level upon the work, no matter at what 7 heightlor: angle the side rods of the machine maybe set 'in their adjustment to the height 7 of thoavoi'k TheLQW'idth of the base 1, it will be observed ,f; is substantially less than the length"" rods, as heretofore.

2 support the 'plvot rod 3 of the machine The rod GX- tends throu h the as )ara-tus and carries a of the hinge rod 7, the ends 14 of which are caused to project beyond the side rods 9. The micrometric pintle devices 15 are mounted on these projecting portions of the hinge rod, and this results in the advantage that the saiddevices are more easily accessible for adjustment, and are more readily removed than when. located between the side I p The hinges 15 are to be of the usual. micrometric form, more particularly described in my Patent No. 813,867. These hinges may be adjusted around the hinge rod being held in place by set screws 16 and 17 and being gaged laterallyby gage marks 19, 20 on the hinge rod. By means of the gage marks on the hinge rod, the hinges may be accurately positioned so as to be regulated at a standard width from each other equal to the standard width of the single lever frame clamp. The pintles on the hinges will. thus always be ready for engagement with the ear sockets of the frame clamp and will permit ready removal of the frame clamp and film for reinking and reinsertion back between the pintles without disturbing the base. The hinges carry pintles 21. 22 between which the clamp '23 of Patent No. 941,500 is inserted. The clamp which comprises fixed and movable jaws ope'ated by the lever and link connection'24t, 25 graspsthe film frame 26 between its jaws. This film frame may thus be accurately placed upon the work, leveled and adjusted with relation to the design to be tinted and may be accurately and micrometrically moved in various directions so as to strengthen or modify the tints that are being'laid down by the artist.

Friction strips 27 are provided running transversely of the base to assist in preventing swerving or shifting of the base and film when the film frame carried by the clamp is being reinserted between the pintles. It ishighly desirable that no swening or shifting of the base occur as otherwise the fine dots or stipple tint carried by the film would not be brought back into registering relation with the dots of the tint already imparted to the drawing before reinking the film, the same applying also to the use of linetints or textures of any character.

-Means are provided for supporting the printing film when the film is away from the workand without causing damage to the film; V

In the best embodiment of the invention I provide the bracket holding the film frame with aback stop or rest adapted to contact with one or more of, the members supporting the bracket and adjusting it and the film framewith relationqto the work. In the particular embodiment of the invention illustrated I make use ofv frame clamp ears 7 30, 31 attached to or made corporate parts ofithe film'frame clamp, these cars socketed,

llll) llll to engage the right and left pintles of the revoluble hinges, but so flared or protuberated in shape that the apeXes or lobes 32 of the ears, when the clamp is turned upward upon its pintle, bear against the sleeves 33 of the hinges, thus supporting the frame clamp and the film carried by it in a backward semi-erect position when lifted and rested back from the work. These ears, acting thus, automatically, as film frame rests and resting the film frame clamp in any position regulated by the angles of the rocking sectors, 4-, or by the finer adjustment angles of the revoluble hinges 15 also prevent the film from falling back upon any of the projecting parts of the hold-fast mechanism at the rear, thus protecting its sensitive fabric from indentation and injury.

Suitable side handles or grips 34 are provided which are attached to the base and enable it to be easily transported and shifted.

In the modification shown in Fig. 6, a stop 35 is provided in the film frame bracket 36 which carries ears 37 This stop is arranged opposite a heel 38 formed in one of the ends of a member or parallel side rod 39 carrying the front hinge rod 40.

In this way when the film frame is thrown up to inspect the work, the stop 35 on the bracket hits the heel 38 or some portion of the end of the side rod which thereby supports the bracket and keeps the film from inj urious contact with the base means or machine parts supported thereon.

l-laving thus described my invention its 7 operation will be clear. It is placed and adj nsted in relation to the level of the work on cardboard, metal or stone, whichever the character of the work may be, and the frame clamp carrying the film frame inserted between the pintles. The film is brought down upon the work, the operation of leveling and registering the design on the film being accomplished by the rotating hinges and the micrometric adjustments carried thereby. The inked design on the film transferred to the subject by a pressing instrument as usual. The film frame may be readily removed from the pint-les, reinked and reinserted in registering relation with the design. The back stops or automatic frame clamp resting cars permit the film when lifted up to be rested away from the work and there sustained in order to inspect its progress at any time without damage to the film.

llhat I claim and desire to secure by Let ters Patent is: i

1. A portable holdfast for printing films of the kind comprising a base, a palr of parallel side rods slidingly and swingingly supported by the base, a forward hinge rod carried by said parallel rods, and micrometric pintle devices on the hinge rod for tiltably supporting and adjusting a film-frame, characterized by the base being a massive, block- .like, concentrated, small-aread sectors carried thereby, through the sectors,

support of substantial height as compared with its width.

A portable holdfast as set forth in claim 1 further characterized by the base being only about twice as wide as it is high.

A portable holdfast asset forth in claim 1, further characterized by the base being higher at the rear than at the front so as to dispose the greater part of the mass of the base toward the back.

it. A portable holdfast for printing films of the kind comprising a base, a pair of parallel side rods slidingly and swingingly supported by the base, a forward hinge rod carried by said parallel rods, and micrometric pintle devices on the hinge rod for tiltably supporting and adjusting a film-frame, cha'racterized by the base being a massive, blocklike. concentrated support of a width materially less than, the length .of the hinge rod, and by the micrometric hinge devices being mounted on projecting ends of the hinge rods outside the parallel rods.

'5. A portable holdfast for printing films of the kind comprising a base, swinging sectors thereon, parallel side rods slidingly supported by the sectors, a forward hinge rod carried by said parallel rods, and micrometric pintle devices on the hinge rod for tiltably supporting and adjusting a filmframe, characterized by a rod joining the sectors to compel the same and the parallel rods to swing in unison.

G. A portable holdfast for printing films comprising a base, upright standards rising from opposite ends of the base, swinging sectors carried thereby, side rods passing through said sectors, a hinge rod carried by the side rods, hinges carried by the hinge rod, a bracket for the film frame pivotally mounted on said hinges, a stop mounted on the bracket said stop adapted to contact with a part of the holdfast thus afi ording a back rest for the film frame and preventing injury to the film when the latter is thrown back from the work.

7. A portable holdfast for printing films comprising a base, upright standards rising from opposite ends of the base, swinging sectors carried thereby, side rods passing through the sectors, a hinge rod carried by the side rods, hinges carried by the hinge rod, a bracket for the film frame pivotally mounted on said hinges, ears mounted on the bracket, lobes on said ears forming stops to contact with a part of the holdfast thus affording a back rest for the film frame and preventing injury to the film when the latter is thrown back from the work.

8. A portable holdfast for printing film's comprising a base, upright standards rising from opposit ends of the base, swinging side rods passing a hinge rod carried by jeeting lobe arranged to swing and rest the side rods hinges carried by the hinge In testimony whereof, I have signed my rod, a bracket for the film frame pivotally name to this specification, 1n the presence of 13 mounted on stud hinges, ears mounted on the two subscribing Witnesses.

bracket each ear being provided with a pro- FLETCHER COWAN against the corresponding hinge for the film Witnesses: frame at each end of the hinge rod when FLORENCE A. SNYDER, the film frame is turned back from the work. W. F. BISSING.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. G. 

